achalasia treatments procedures

gastroesophageal achalasia esophagus endoscopic gastric poem peroral myotomy muscle procedure treatment vector gastroscopy invasive disorder pneumatic dilation balloon dilator guide wire inflation botulinum toxin injection air inflated stomach swallow mucosa submucosa endoscope esophageal movement les blocked closed tunnel nonsurgical sphincter fibers junction digestive system gastroenterologist illustration endoscopy therapy